Golf club fitting method, device thereof, and analysis method

Abstract

The analysis method includes steps of acquiring measurement data obtained from swings and values of hitting results (flight distance or the like) (STEP 3 ); calculating a characteristic value (face angle or the like) from the measurement data (STEP 4 ); and determining an indicator for selecting a shaft of a golf club from the characteristic value and the values of hitting results (STEP 5 ). In the step of determining an indicator, when a hitting result of a golf club is an objective variable, and the characteristic value is an explanatory variable together with a predetermined shaft physical property (flex point or the like), and has a statistically significant relation with the hitting result, the characteristic value is determined as the indicator. A relational expression of the indicator and the hitting result is calculated for each value of the physical properties.

What is claimed is: 
     
       1. A golf club fitting method, comprising steps of:
 preparing, by a processor, a relation C 1  in which a face angle before or at ball impact and a hitting result are considered, wherein the face angle and the hitting result are measured when a plurality of golf players makes swings using a plurality of golf clubs with different values of shaft physical properties; 
 obtaining, by the processor, a measurement result of the face angle by a subject (golf player) hitting a ball with a test club; and 
 determining a shaft physical property which fits the subject on the basis of the relation C 1  and the measurement result of the face angle. 
 
     
     
       2. The fitting method according to  claim 1 , wherein the relation C 1  is a relational expression F 1 . 
     
     
       3. The fitting method according to  claim 2 , wherein when a relational expression of the hitting result and the face angle is F 11  and a relational expression of the face angle and the shaft physical properties is F 12 , the relational expression F 1  is the relational expression F 12  created by using the relational expression F 11 . 
     
     
       4. The fitting method according to  claim 3 , wherein the relational expression F 12  is such a relational expression that the greater the measured face angle is, the lower a recommended shaft flex point is. 
     
     
       5. The fitting method according to  claim 3 , wherein a preferable hitting result at a standard shaft flex point Th is reflected in the relational expression F 12 . 
     
     
       6. The fitting method according to  claim 3 , wherein two or more types of hitting results are considered in the relational expression F 12 . 
     
     
       7. The fitting method according to  claim 6 , wherein the relational expression F 12  is created by modifying a relational expression based on a first hitting result, on the basis of a second hitting result. 
     
     
       8. The fitting method according to  claim 7 , wherein the modification based on the second hitting result is such a modification that the second hitting result is preferable at the standard shaft flex point Th. 
     
     
       9. The fitting method according to  claim 7 , wherein the first hitting result is a direction of a hit ball, and the second hitting result is flight distance. 
     
     
       10. The fitting method according to  claim 3 , wherein in the relational expression F 12 ,
 the measured face angle is a first input variable; 
 a value showing a relation of a shaft flex point rate of the test club and the standard shaft flex point Th is a second input variable; and 
 the shaft flex point rate which fits the subject is a result variable. 
 
     
     
       11. The fitting method according to  claim 1 , wherein the shaft physical property is a shaft flex point. 
     
     
       12. The fitting method according to  claim 3 , wherein the relational expression F 11  and/or the relational expression F 12  is a linear expression. 
     
     
       13. The fitting method according to  claim 3 , wherein the hitting result in the relational expression F 11  is a right/left direction in which a ball flies. 
     
     
       14. A golf club fitting method, comprising steps of:
 acquiring, by a processor, measurement data and hitting results of a plurality of golf players using a plurality of golf clubs with different values of shaft physical properties; 
 obtaining, by the processor, characteristic values on the basis of the measurement data; 
 determining, by the processor, an indicator for selecting a shaft of a golf club from the characteristic values and the hitting results; 
 obtaining, by the processor, a relational expression F 1  of the indicator and the hitting result for each value of the shaft physical properties; 
 obtaining, by the processor, a measurement result corresponding to the indicator by a subject (golf player) hitting a ball with a test club; and 
 determining a shaft physical property which fits the subject on the basis of the relational expression F 1  and the measurement result, 
 wherein in the step of acquiring the multiple measurement data pieces and the hitting results, 
 multiple measurement data pieces are obtained from swings of the golf player and hitting of the swings, and 
 wherein in the step of determining the indicator, 
 the characteristic value is determined as the indicator when the hitting result is an objective variable, the characteristic value and the value of the shaft physical property are explanatory variables, and the characteristic value has a statistically significant relation with the hitting result. 
 
     
     
       15. The fitting method according to  claim 14 , wherein
 in the step of determining an indicator, a plurality of indicators is determined, 
 the method further comprising steps of: 
 calculating an accuracy rate of values of shaft physical properties determined from the plurality of indicators; and 
 selecting an indicator used in fitting of a golf club on the basis of the accuracy rate, 
 wherein in the step of calculating the accuracy rate of values of shaft physical properties, 
 a value Xa of a fit shaft is selected based on a relational expression F 1  of the indicator and the hitting result; 
 a value Xb of a fit shaft is determined based on a value of a hitting result to be obtained from the swings; and 
 a golf player rate for which the value Xa and the value Xb match is calculated, and the rate is an accuracy rate, 
 wherein in the step of selecting an indicator used in fitting of a golf club, 
 an indicator with the highest accuracy rate is selected as the indicator used in fitting. 
 
     
     
       16. The fitting method according to  claim 14 , wherein
 the hitting result is flight distance of a ball; 
 the shaft physical property is a shaft flex point; and 
 the characteristic value is a face angle before or at ball impact. 
 
     
     
       17. The fitting method according to  claim 14 , wherein
 the hitting result is a right/left direction in which a ball flies; 
 the shaft physical property is a shaft flex point; and 
 the characteristic value is a face angle before or at ball impact. 
 
     
     
       18. The fitting method according to  claim 17 , wherein
 a value X of a face angle at which an absolute value of a direction in which a ball flies is  0  is determined, for each value Y of the shaft flex point; 
 an approximate expression
     Y=A 1· X+B  
 
 
 
       (A coefficient A 1  and an intercept B are n constant) which satisfies each relation of the value Y of the flex point of the plurality of shafts and the value X of the face angle is determined; and
 the approximate expression is the relational expression F 1 . 
 
     
     
       19. The fitting method according to  claim 18 , wherein the intercept B is modified based on a relation of flight distance of a ball and a value of a face angle. 
     
     
       20. A method for analyzing swings of a golf club, comprising steps of:
 performing the following steps by a processor; 
 acquiring measurement data and hitting results of a plurality of golf players using a plurality of golf clubs with different values of shaft physical properties; 
 obtaining characteristic values on the basis of the measurement data; 
 determining an indicator for selecting a shaft of a golf club from the characteristic values and the hitting results; and 
 obtaining a relational expression F 1  of the indicator and the hitting results for each value of the shaft physical properties, 
 wherein in the step of acquiring the multiple measurement data pieces and hitting results, 
 multiple measurement data pieces are obtained from swings of golf players and hitting of the swings, and 
 wherein in the step of determining the indicator 
 the characteristic value is determined as the indicator, when the hitting result is an objective variable, the characteristic value and the value of the shaft physical property are explanatory variables, and the characteristic value has a statistically significant relation with the hitting result. 
 
     
     
       21. The method for analyzing according to  claim 20 , wherein
 in the step of determining the indicator, a plurality of indicators is determined, 
 the method comprising steps of: 
 calculating accuracy rates of values of shaft physical properties determined from the plurality of indicators; and 
 selecting an indicator used in fitting of a golf club, 
 wherein in the step of calculating accuracy rates of values of shaft physical properties, 
 a value Xa of a fit shaft is selected based on a relational expression F 1  of the indicator and the hitting result; 
 a value Xb of a fit shaft is determined based on a value of a hitting result to be obtained from the swings; and 
 a golf player rate for which the value Xa and the value Xb match is calculated, and the rate is the accuracy rate, 
 wherein in the step of selecting an indicator used in fitting of a golf club, 
 an indicator with the highest accuracy rate is selected as the indicator used in fitting. 
 
     
     
       22. The method for analyzing according to  claim 20 , wherein
 the hitting result is flight distance of a ball; 
 the shaft physical property is a shaft flex point; and 
 the characteristic value is a face angle before or at ball impact. 
 
     
     
       23. The method for analyzing according to  claim 20 , wherein
 the hitting result is a right/left direction in which a ball flies; 
 the shaft physical property is a shaft flex point; and 
 the characteristic value is a face angle before or at ball impact.